Floyd Mayweather Jr. has always said it would take another nine-figure payday to get him out of retirement. That's exactly what he's expected to get when he faces UFC lightweight champion Conor Mcgregor in a boxing match on August 26 at the T-Mobile Arena in Las Vegas.

Credit: Floyd Mayweather on Instagram

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According to Keith Idec of Boxing Scene, Mayweather is expected to make at least $100 million but his take could balloon to four times that much if the event hits all of its monetary metrics. McGregor will make at least $30 million, which is twice what he's made for any UFC event.

McGregor has made millions from endorsement and other revenue, but he's never made this kind of money simply for fighting. His take could grow exponentially as well if the event is as big of a success as it's pacing to be.

Boxing Kingdom estimates the purses could be as high as $400 million for Mayweather and $127 million for McGregor.

That's the type of purse that would seemingly set an athlete up for life with no real need to compete again. Then again, Mayweather reportedly took home a similar payday in 2015 when he defeated Manny Pacquiao. UFC President Dana White has already said he fully expects McGregor to defend his 155-pound title in the Octagon before the end of the year. If that happens, it should be a fruitful year for the Irishman, win or lose.

All of the purses are an estimate. Mayweather Promotions CEO Leonard Ellerbe says the two sides have a confidentiality agreement that restricts them from revealing all of the financial details publicly. There will be a preliminary release of the purses, per Nevada State Athletic Commission law the day before the fight, but that is only a baseline figure.

The percentages of the gate, pay-per-view buys and other bonuses will not be included in those numbers.

Love it or hate it, this event is going to be a huge financial success.